Research on the structure and performance of iron-based alloy coating based on gradient transition
An iron alloy coating with gradient transition was sprayed on F304 stainless steel substrate by plasma spraying method and with a gradient material obtained by the material performance simulation software,and the effect of gradient transition on the microstructure,hardness and wear resistance of the coating was analyzed by comparing with the non gradient transition coating.The results showed that both the gradient coating and the non gradient coating had wavy layered structure and are formed by highly flattened deformed particles overlapping each other.Micro metallurgical bonding was observed between the coating particles,and oxides were observed between the coating and the substrate,between the flat particles and inside the flat layer.The coating microstructure included austenite phase,ferrite phase and carbides.The surface hardness of the gradient coating and the non gradient transition coating were basically similar,but there were obvious steep drop steps between the section hardness of the non gradient coating and the substrate hardness,while the section hardness of the gradient coating and the substrate hardness changed gently,and the section hardness of the gradient coating was slightly lower than that of the non gradient coating.The wear rate of gradient coating was similar to that of non gradient coating at 400 ℃,but it was lower than that of non gradient transition coating at 350 ℃.The reason for reducing hardness changes and improving wear resistance of the coating may be related to the improvement of the microstructure and plasticity of the coating by the gradient layer,but more research is needed.
iron based alloysgradient materialsplasma sprayingmicrostructurehardnesswear resistance
万方数据
维普
